Ore-pulverizing mill



(No 11a-0861.1 n 8 sheets- 811688 2 W.I. TUSTIN. 1 v ORE PULYBRIZING MILL.

No. 248,122. I Patented 001. 11,1881.

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1 W. I. TUSTIN. f

ORE PULVERIZING MILL.

y 110.248.122. Patented 001.1111881.

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UNITED STATES PATENT OFFICE- IVILLIAMI. TUSTIN,^OF SAN FRANCISCO, CALIFORNIA.

ORE-PurvlaulziNG'MILL.

SPECIFICATION forming part of vLetters Patent No. 248,122, dated October 11, 1881.

Application filed March 1T, 1881.

To all whom it may concern:

Be it known that I, WILLIAM I. TUsTIN, ot the city and county of San Francisco, in the State ot' California, have made and invented certain' new and useful I mprovementsin Ore- Pulveriziiig Mills; and I do hereby declare that the following' is a full, clear, and exact descripltion of my said invention, reference being had to the accompanying drawings.

My invention has reference to'tliat class of crushing and pulverizing mills in which the ore or other substance to be crushed and pulverized is placed inside arotating barrel or cylinderand subjected therein to the crushing and grinding action of one or niore balls, cylinders, or weights.

T helobject of the invention is to improve the construction ofthe several parts, whereby the 'operation of the orepulverizing mill is more et'- fective both in feeding and grinding the ore. These objects l attain by the construction substantially asshown in the drawings and hereinafter described.

In the drawings, Figure lis a transverse vera side elevation in section. Fig. 3 is an end view of the mill, showing a vert-ical section of the cylinder and the rods connecting the independent shaft or axle with the feeding mechanisin. Fig.4 is asideelevatiomshowing feedhopper and graduated scale. Fig. 5 is a topplan view, showing the manner of connecting the independent shaft with the feeding mechanism. Fig. 6 shows the ratchet and pawl for setting the feed mechanism at a fixed point. Fig. 7 shows the saine device arranged to perinit an automatic feed.

A is a short barrel or cylinder made of iron castings. Each side may be made of one casting and the rim of two castings, or each` side and its half of the rini can be made of a single casting. In Fig. 1 I have represented the rim as being made of two separate pieces, which are bolted to the periphery of the side pieces.

Each rim casting B extends only partially across the space between vthe sides, and it has af rectangular llange, (l, projecting outward from its inner edge. The space betweenthese flanges forms the groove or channel which surrounds tlie cylinder midway between its sides, while the portion on each side of the channel 'tical section of-iny pulverizing-mill. Fig. 2. is,

(No model.)

forms tracks Z for rollers to move upon. A wire cloth or screen, D, is stretched across this space entirely around the cylinder, and is bolted to the outer edges of the flanges, as shown. A removable lining, E, is placed around the interior of the cylinder against its rim, and slots a'a are cut in it transversely across the channel, so as to form the cross-bars or grating. These slots are iliade quite narrow for a short distance, and then at intervals wider slots a are made, so that any particles which may pass through the narrow slots andare too large to pass throughthe screen will find their way4 back in to the cylinder again through these wide slots as the cylinder rotates. A partition or elevating-shelf, b, is placed across this channel on one side of each wide slot, so that the particlcs which pass through the main slots and are too'large to pass through the screen will be arrested anddirected into the cylinder again, and thus be .prevented from remaining in the channel.

The cylinder is4 mounted onV hollow trunnions F F', which are cast in separate pieces and bolted to each' head of the cylinder. Each hollowtru'nnioii has an enlarged end, which tits against and is bolted to the inside of the cylinder in the center ot' each side, while the trunnions pass through the sides and rest upon the bearings on which the cylinder is supported. -The inside large end of each truniiioii has a rim, d, projecting from its outer edge, and

a skeleton end or head, G, forms a box or hub, e, for a shaft, vH,that`passes across the center of thecyliiider and through one of the hollow trunnions. Upon this shaft, between the hubs c, a head or casting, j', is secured, from which two radial arms, I I, extend. A chute, J, is secured upon the head or castiugf,so as to extend across the inside of the cylinder above the vcenter shaft, for the purpose hereinafter stated. Inside of this barrel or cylinder, below the radial arms, I place one or more weights or rollers, K K. Usually these weights will be short rollers extending across the lloor of the cylinder and resting upon both the side tracks and intervening grating. Two or more of such rollers will be placed inside ot' the barrel or cylinder, side by side, so that they will press Ioc l hand or pointer on the scale.

ets or cavities, a, extending across the midf dle portion of the roller in a longitudinal direction, leaving the ends of the rollers smooth and plain, as shown at Figs. 8 and 9, Sheet 3. These cavities or pocketsserve as buckets to catch the ore and throw it fofward or backward upon the intermediate rollers, thus preventing the ore from accumulating behind the rear roller or in front of the front roller. Each one of the rollers'ran be supplied with these pockets or buckets, if desired.

The cylinder is driven byypower applied to a spur-wheel, L, on the trunnion F', so as to rotate it continuously in one direction. The ore is fed into the cylinder through the hollow trunnion F by an automatic feeding device, hereinafter explained, so as to fall upon or in front of the rollers. One of the radial swinging armsIextends on each side of'the series of rollers, so as to keep them in their proper relative positions, while the chtite J serves to catch any oro that may be carried up and fall from the side of the cylinder and-transfer or conduct it to the opposite side of the cylinder, in front of the rollers. The headf, with its arms I, confines the rollers` K within a given space, and prevents them from being brought in contact with-the chute J.

The barrel or cylinder I surround by a case, M, the bottom of which is open, and in a housing on the top of this case, or at any other convenient point, I mount a rotary brush, N, so that its bristles will brush against the screen as it passes and free it of any particles which may lodge in its meshes. Now, as the cylin der rotates the rollers will be carried a short distance up its ascending side,'the height to which they will be carried being proportionate to the friction and resistance they encounter and the speed ofthe rotation ot the cylinder. When the end roller strikes the swinging radial arm I it will carry that arm up with it and partially rotate the shaft H, to which the radial arms 'are attached. The friction and resistance encountered by these rollers is in proportion 'to the amount of ore in the cylinder-that is, the greater the quantity of ore in the cylinder the greater will be the resistance encountered by the rollers and the higher they will be carried up the side of the cylinder. I therefore attach a pointer or indicatinghand, O, to the end of the shaft H outside the trunnion, and secure a graduated indicating-scale, P, opposite the pointer, so that the position of the rollers will be indicated bythe I can thus at any time determine at a glance what is the quantity of ore in the cylinder.

By properly constructing my feeding device and connecting it with the shaft H, I am also able to provide an automatic feeder i n the following manner:

Q is the hopper of the feeder, in which the ore is placed. This hopper I attach to a bar, R, suspended by means of a hinge, h, from a stanchion, post., or frame,"S, so that the hopper will shaped teeth j; and on the'han gin g bar R, I se- 7 5 cure a block, k, which will ride over these teeth and drop from their points to their bases as the cylinder rotates, thus giving to the swinging hopper and its feeding tube or spout abackand-forth motion and concussion or jar. In the outer end of this feeding-spout T, outsideofthe 'opening which leads from the hopper into the tube, I place a stationary plunger, U, that will force the ore through the tube every time the hopper moves back and allow the ore to drop down into the tube in front of it every time the hopper moves forward.

In order to render the feeding operation antomatic, I extend the lower end of this swinging har It, to which the hopper is attached, to a considerable distance below the hopper. At one side ofthe machine I secure an arm or lug, l, Fig. 5, and to the outer end of this lug I attach one end of a lever, m. This lever extends horizontally alongside the machine, passing insideot' the lower end of the swinging har R, and its opposite end I connect by means of a rod, n, with one arm of a bell-crank lever,p, on the opposite side ofthe machine. The other arm of the bell-crank lever I connect by a rod, q, with an arm, r, on the shaft H, and this arm l', being attached to the same shaft with the indicating-pointer O, will move with the shaft, so that when too much ore is being fed to the cylinder the rollers will be carried higher up the side of the cylinder, and the shaft H will be caused to rotate bythe action of the rollers upon the radial arms. Through the medium of theconn'ecting-rods and bellcrank lever this rotation of the shaft H will cause the horizontal .lever m to move the lower end of the swinging har It and the hopper outward, so that the ratchet-teeth on the ring z' will have less effect on the swinging mechanism, and wil'l reduce the amount of ore fed to the cylinder.

In some cases it will be necessary to suspend the feeding operation entirely, and yet allow the cylinder to rotate. To provide for this I attach a horizontal bar or arm, V, Fig. 6, to the side of the machine, so that it will project IOO IIO

out under the moving end of this lever m. The upperedge of this arm I form into ratchet-teeth,

plate is smooth, and projects slightly above the teeth on the arm when thus horizontally fixed, so that the`pawl w will ride on the smooth edge, as shown in Fig. 7. When the plate is raised up in this manner the automatic opera tion of the feeding mechanism is not interfered with, as the lever m will move freely and be actuated, as 'hereinbefore described, by the rollers, radial arms, and shaft H.

I thus provide a complete, positive, and reliable rotary pulverizing-mill, and by supplying an automatic feeding device I remove one of the principal objections heretofore urged against this class ot' mills-to wit, difficulty of regulating` lthe feed.

Having lthus fully-"described my invention, what I claim, and. desire to secure by Letters Patent, is-

1. In a rotary crushing and grinding` mill, thev case M, in combinationwith the cylinder A, formed in two sections, and provided with screen D and internal lining, E, substantially as shown, and for the purpose described.

2. In an ore-grinding mill, the combination ofthe ore-c vlinder provided with tracks z, the rollers K K, and the elevating-shelves b, as set forth.

3. The swinging radial arms I I, connected with the rotating axial head or hub e, in combination with a series ot' crushing-rollers, said arms extending upon opposite sides thereof, substantially as and for the purpose set forth.

4. In combination'with a rotary barrel or crusher provided with a groove or channel formed in its rim and shelves or elevators b, shaft H, the chute J, the head f, provided with the radial arms I I, arranged as described, and the rollers K K, substantially as and for the purpose described.

5. In a rotary crushing and grinding mill, the swinging radial arms I I, crushing-rollers K K, arranged as described, the indicating hand or pointer O, the shaft I-I', and the graduated indicati n g-scale I), combined and arranged substantially as herein setforth.

6. In combination with a hollow trunnion, a swinging hopper, Q, having a tube or spout, T, leading from 'its lower end through the hollow trunnion, of the ratchet-rin gi, and the block K on the hopper, substantially as described.

- 7. In combination with the hollow trunnions F F, the swinging radial arms I I, the shaft H, and the crushing and grinding rollers K K,

fot the swinging hopper Q, downwardly-projecting bar R, the lever m., arm r, connecting-l rod n., bell-crank lever p, and connecting-rod g, substantially as above described.

8. In combination with the horizontal lever n, the arm 1', intermediate connections, and the shaft H of the ratchetbar V, lever m, and the pawl projection w, substantially as and for purpose described.

9. In a rotary crushing or grinding mill,the hopper Q, supported byhin ged bar R, said hopp'er having an inclined tubeor spout, T, in com bination with the stationary plunger U and hollow trunnion F, and means, substantially as described and shown,` for imparting to the hopper aswinging motion, substantiallyas and t'or the purpose set forth.

In Witness whereof' I. have hereunto lset my hand and seal. y

Attest WM. F. CLARK, W. Vorr. 

